Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Jan. 31, 2021	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Common stock, voting rights			Each share of common stock is entitled to one vote
Issuance of common stock, net of issuance costs			$ 40,716,544	$ 7,891,678
Proceeds from issuance of common stock			$ 40,716,544	$ 7,891,678
Underwritten Public Offering [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Proceeds from issuance of common stock	$ 70,000,000.0
Jefferies Sales Agreement [Member] | Jefferies LLC [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares			9,351,749	1,347,156
Proceeds from issuance of common stock			$ 40,700,000	$ 8,000,000.0
Volume-weighted average price			$ 4.62	$ 9.73
Jefferies Sales Agreement [Member] | Jefferies LLC [Member] | Maximum [Member]
Class Of Stock [Line Items]
Expected aggregate gross proceeds from issuance of stock		$ 50,000,000.0
Common Voting Stock [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares			9,351,749	1,347,156
Issuance of common stock, net of issuance costs			$ 9,352	$ 1,348
Common Voting Stock [Member] | Underwritten Public Offering [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Issuance of common stock, net of issuance costs, Shares	7,868,421
Shares issued, price per share	$ 9.50
Issuance of common stock, net of issuance costs	$ 74,700,000
Employee Stock Options [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares			4,608,311
Two Thousand And Thirteen Incentive Plan [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares			1,224,865
2016 Employee Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Common stock reserved for issuance of shares			857,446